Resistant-surface alloy of iron



objects will be in part lent results, I include the Patented Nov. 3,192,5, 1

UNITED STATES PATIENT OFFICE.

GEORGE E. CHARLS, or cannon, 01110, ASSIGNOR T0 unrrnn ALLQYSTEEI:conroniiwon, or cannon, o no, A conronnrron on NEW YORK.

IRESIS'JJAN'J.-SURIEA('JE ALLOY OF IRON.

No Drawing.

To all whbm it may concern:

Be it known that I, Gnoner. H. Grunts, a citizen of the United States,and a resident of Canton, Stark County, State of ,Ohio, have invented anImprovement in Re sistant-Surface Alloys of Iron, of which the followingis aspecification.

This invention relates to iron alloys. One of the objects thereof is toprovide a practical alloy of iron of such nature that its surface willbe dependably resistant to seveie corroding or discoloring influencesand will maintain its originalcharacter and appearance. Anotherobject'is to provide an alloy in which the above advantages are attainedwithout sacrifice of physical erties' or undue increase of cost.

obvious or in part pointed out hereinafter.

The invention accordingly consists inthe combinations of constituentsand in the ideas and features herein illustrativelyc described, and thescope of the'application of which will be indicated in the appendedclaims,

As an illustrative embodiment of this invention which I have found togive excelllowing elenients in the following propo ions: chromium from16.0% to 20.0%, and molybdenum from .05% to 12%. These are incorporatedin an iron alloy, and it may be noted I that the term iron alloy: isbroadly used to include compositions in which carbon may or may not bepresent according as it is or is not specified. I

It is also to be noted that the term re-. 'sistant-surfaceis used todenote a characteristic of the metal whereby it, throughout its entiremass, is adapted to presenta surface. which strongly resists anytendencies to discoloration, corrosion, or other alteration by heatorany' other agency.

The carbon is preferably kept low, by

which is meant, in thisconnection, 20% orunder. In fact, I have, foundhighly desirsible.

able results with a carbon range of from .03 0 to .07%.

Elements such phur, usuall iron and stee as phosphorous I and sulresentin all commercial s ould be kept aslow as pos There is preferably addedan amount of Application filed April 14, 1924. Serial No. 706,567.

a scavenger and thus permit the remaining elements to coact to the besteffect, and it is to be understood that this element, as Well added insuch manner as to difluse unif0rmly throughout theinass of themetal.

The'ranges abovev set forth are by no means limiting, as veryconsiderable de-- viations therefrom may be made 'and subas the othersabove set forth, is preferably stantial benefit of the. invent-ionretained.

Accordingly, in certain of the claims, ranges of the-constituentelements broader than the above preferred range are'specified by settinghigher or lower limiting percentages. I I The element molybdenum,however, is preferably ,kept low, in fact its full effect in imattainedbelow 35%, and a substantially smaller amount gives better results.

Alloys such as' that above described will be found to achieve theobjects of this invention and theadvantages hereinabove noted allwithout special heat treatment. a As, variations might be made in theembodiment of my invention herein described without departure from itscope, it is to be understood that all mat' r herein is to beinterpreted as illustrative andnotin a limiting' sense; I claim as myinvention:

A resistant-surface alloy of iron containing as the principal elements,in combination with the iron, silicon from .50% to 6.0%, chromium from3.0% to 30.0%, and molybdenum in an effective amount not ex- I ceeding'.35%.

I 2. A resistant-surface alloyof iron containing as the principalelements, in combl- Y parting aqresistant surface to the alloy is nationwith the iron, silicon from .50% to 6.0%, chromium from 3.0% to 30.0%,mo lybdenum in an effective amount not exceeding 35%, and carbon inaneffective amoun not exceeding 20%. i

' 3. A resistant-surface alloy of; iron containing as the principalelements, in combination withthe iron, chromium from 16.0% to 25.0%,silicon from 1.0% to 4.0%,. molybdenum in, an efl'ective amount notexceeding 35%, .and carbon in an eifective amount not exceeding 10%.

4. A resistant-surface alloy of iron containing as the rincipalelements, in combination with t e iron, molybdenum from .05% .to 20%,chromium from 3.0% to 25.0%, silicon from .50% to 5.0%, and carbon 1n aneifective amount not exceeding 20%.

5. A resistant-surface alloy of iron containing as the principalelements, in combination with the iron, chromium from 16.0%

-' to 25.0%, molybdenum from 05% to silicon from .50% to 5.0%, andcarbon in an effective amount not exceeding .20%.

6. A resistant-surface alloy of iron containing as the principalelements, in combination with the iron, silicon from 1.3% to 4.0%,chromium from 3.0% to 25.0%, and molybdenum in an efi'ective amount notex? ceeding 35%.

7. A resistant-surface alloyof iron containing as the principalelements, in combination with the iron, silicon from 1.3% to 4.0%,chromium from 3.0% to 25.0%, molybdenum in an effective amount notexceeding 35%, and carbon in an effective amount not exceeding .10%.

8. A resistant-surface alloy of iron containing as the principalelements, in combination With the iron, molybdenum from .05% to 20%,chromium from 16.0% to 25.0%, silicon from 1.0% to 4.0%, and carbon inan effective amount not exceeding 9. A. resistant-surface alloy of ironcontaining as the principal elements, in combination with the iron,molybdenum from .05% to 12%, chromium from 16.0% to 20.0%, silicon from1.0% to 2.50%, and carbon from 03% to .07

10. A resistant-surface alloy of iron con taining as the principalelements, in combination with theiron, chromium from 3.0%

GEORGE H. CHARL S.

